Use Application Command to edit RichTextBox

   
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="350" Width="500">
    <DockPanel>
        <StackPanel DockPanel.Dock="Top" Orientation="Horizontal">
            <StackPanel.Resources>
                <Style TargetType="{x:Type Button}">
                    <Setter Property="CommandTarget" Value="{Binding ElementName=rtbTextBox1}" />
                </Style>
            </StackPanel.Resources>
            <Button Content="Clear" Name="btnClear" Click="btnClear_Click" />
            <Separator Margin="5"/>
            <Button Content="Cu_t" Command="ApplicationCommands.Cut" />
            <Button Content="_Copy" Command="ApplicationCommands.Copy" />
            <Button Content="_Paste" Command="ApplicationCommands.Paste" />
            <Separator Margin="5"/>
            <Button Content="_Undo" Command="ApplicationCommands.Undo" />
            <Button Content="_Redo" Command="ApplicationCommands.Redo" />
            <Separator Margin="5"/>
            <Button Content="_Bold" Command="EditingCommands.ToggleBold" />
            <Button Content="_Italic" Command="EditingCommands.ToggleItalic" />
            <Button Content="Underline" Command="EditingCommands.ToggleUnderline" />
            <Separator Margin="5"/>
            <Button Content="_Right" Command="EditingCommands.AlignRight" />
            <Button Content="C_enter" Command="EditingCommands.AlignCenter" />
            <Button Content="_Left" Command="EditingCommands.AlignLeft" />
        </StackPanel>
        <RichTextBox DockPanel.Dock="Bottom" Name="rtbTextBox1"
                     HorizontalScrollBarVisibility="Visible" 
                     VerticalScrollBarVisibility="Visible">
            <FlowDocument>
                <Paragraph FontSize="12">
                    paragraph
                </Paragraph>
                <Paragraph FontSize="15">
                    paragraph
                </Paragraph>
                <Paragraph FontSize="18">A List</Paragraph>
                <List>
                    <ListItem>
                        <Paragraph>
                            <Bold>Bold List Item</Bold>
                        </Paragraph>
                    </ListItem>
                    <ListItem>
                        <Paragraph>
                            <Italic>Italic List Item</Italic>
                        </Paragraph>
                    </ListItem>
                    <ListItem>
                        <Paragraph>
                            <Underline>Underlined List Item</Underline>
                        </Paragraph>
                    </ListItem>
                </List>
            </FlowDocument>
        </RichTextBox>
    </DockPanel>
</Window>
//File:Window.xaml.vb
Imports System.Windows

Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Public Sub New()
      InitializeComponent()
    End Sub
    Private Sub btnClear_Click(sender As Object, e As RoutedEventArgs)
      rtbTextBox1.SelectAll()
      rtbTextBox1.Cut()
    End Sub
  End Class
End Namespace

1.	Programmatically Insert Text into a RichTextBox
2.	Get selected text from RichTextBox by using RichTextBox.Selection.Text
3.	Get Caret Position in a RichTextBox by using RichTextBox.CaretPosition.GetPositionAtOffset
4.	Get the content from the rich text box.
5.	Add / Remove TextChanged event for RichTextBox
6.	Clear any formatting applied to the text with TextRange.ClearAllProperties();
7.	Apply Syntax Highlighting in a Text Control
8.	Select all text from RichTextBox and cut
9.	Load or Save the Content of a RichTextBox
10.	Display a Password Entry Box and get the input

Use Application Command to edit RichTextBox : RichTextBox « Windows Presentation Foundation « VB.Net

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